package com.qfjg.minioconfig;


import io.minio.*;
import io.minio.messages.DeleteError;
import io.minio.messages.DeleteObject;
import io.minio.messages.Item;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.util.stream.Collectors;

/**
 * @description： minio工具类
 * @version：1.0
 */
@Component
public class MinioUtils {
    @Autowired
    private MinioClient minioClient;

    @Value("${minio.bucketName}")
    private String bucketName;

    /**
     * description: 判断bucket是否存在，不存在则创建
     *
     * @return: void
     */
    public void existBucket(String name) {
        try {
            boolean exists = minioClient.bucketExists(BucketExistsArgs.builder().bucket(name).build());
            if (!exists) {
                minioClient.makeBucket(MakeBucketArgs.builder().bucket(name).build());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 创建存储bucket
     *
     * @param bucketName 存储bucket名称
     * @return Boolean
     */
    public Boolean makeBucket(String bucketName) {
        try {
            minioClient.makeBucket(MakeBucketArgs.builder()
                    .bucket(bucketName)
                    .build());
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 删除存储bucket
     *
     * @param bucketName 存储bucket名称
     * @return Boolean
     */
    public Boolean removeBucket(String bucketName) {
        try {
            minioClient.removeBucket(RemoveBucketArgs.builder()
                    .bucket(bucketName)
                    .build());
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * description: 上传文件
     *
     * @return: java.lang.String
     */
    public List<String> upload(MultipartFile[] multipartFiles) {
        List<String> names = new ArrayList<>(multipartFiles.length);
        for (MultipartFile file : multipartFiles) {
            String originalFilename = file.getOriginalFilename();
            String fileExtension = "";

            if (originalFilename != null && originalFilename.contains(".")) {
                fileExtension = originalFilename.substring(originalFilename.lastIndexOf("."));
            }

            String fileName = UUID.randomUUID().toString() + fileExtension;

            try (InputStream in = file.getInputStream()) {
                minioClient.putObject(PutObjectArgs.builder()
                        .bucket(bucketName)
                        .object(fileName)
                        .stream(in, file.getSize(), -1)
                        .contentType(file.getContentType())
                        .build()
                );
            } catch (Exception e) {
                e.printStackTrace();
            }

            names.add(fileName);
        }
        return names;
    }
//    public List<String> upload(MultipartFile[] multipartFile) {
//        List<String> names = new ArrayList<>(multipartFile.length);
//        for (MultipartFile file : multipartFile) {
//            String fileName = file.getOriginalFilename();
//            String[] split = fileName.split("\\.");
//            if (split.length > 1) {
//                fileName = split[0] + "_" + System.currentTimeMillis() + "." + split[1];
//            } else {
//                fileName = fileName + System.currentTimeMillis();
//            }
//            InputStream in = null;
//            try {
//                in = file.getInputStream();
//                minioClient.putObject(PutObjectArgs.builder()
//                        .bucket(bucketName)
//                        .object(fileName)
//                        .stream(in, in.available(), -1)
//                        .contentType(file.getContentType())
//                        .build()
//                );
//            } catch (Exception e) {
//                e.printStackTrace();
//            } finally {
//                if (in != null) {
//                    try {
//                        in.close();
//                    } catch (IOException e) {
//                        e.printStackTrace();
//                    }
//                }
//            }
//            names.add(fileName);
//        }
//        return names;
//    }

    /**
     * description: 下载文件
     *
     * @param fileName
     * @return: org.springframework.http.ResponseEntity<byte [ ]>
     */
    public ResponseEntity<byte[]> download(String fileName) {
        ResponseEntity<byte[]> responseEntity = null;
        InputStream in = null;
        ByteArrayOutputStream out = null;
        try {
            in = minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(fileName).build());
            out = new ByteArrayOutputStream();
            IOUtils.copy(in, out);
            //封装返回值
            byte[] bytes = out.toByteArray();
            HttpHeaders headers = new HttpHeaders();
            try {
                headers.add("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            headers.setContentLength(bytes.length);
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            headers.setAccessControlExposeHeaders(Arrays.asList("*"));
            responseEntity = new ResponseEntity<byte[]>(bytes, headers, HttpStatus.OK);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseEntity;
    }

    /**
     * description: 获取文件流
     */
    public ResponseEntity<byte[]> getImageStream(String fileName) {
        HttpHeaders headers = new HttpHeaders();
        try (InputStream in = minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(fileName).build());
             ByteArrayOutputStream out = new ByteArrayOutputStream()) {

            IOUtils.copy(in, out);
            byte[] bytes = out.toByteArray();

            headers.add("Content-Disposition", "inline;filename=" + URLEncoder.encode(fileName, StandardCharsets.UTF_8.toString()));
            headers.setContentLength(bytes.length);
            headers.setContentType(MediaType.IMAGE_JPEG);
            headers.setAccessControlExposeHeaders(Collections.singletonList("Content-Disposition"));

            return new ResponseEntity<>(bytes, headers, HttpStatus.OK);
        } catch (Exception e) {
            e.printStackTrace();
            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

/**
 * 查看文件对象
 *
 * @param bucketName 存储bucket名称
 * @return 存储bucket内文件对象信息
 */
public List<ObjectItem> listObjects(String bucketName) {
    Iterable<Result<Item>> results = minioClient.listObjects(
            ListObjectsArgs.builder().bucket(bucketName).build());
    List<ObjectItem> objectItems = new ArrayList<>();
    try {
        for (Result<Item> result : results) {
            Item item = result.get();
            ObjectItem objectItem = new ObjectItem();
            objectItem.setObjectName(item.objectName());
            objectItem.setSize(item.size());
            objectItems.add(objectItem);
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    return objectItems;
}

/**
 * 批量删除文件对象
 *
 * @param bucketName 存储bucket名称
 * @param objects    对象名称集合
 */
public Iterable<Result<DeleteError>> removeObjects(String bucketName, List<String> objects) {
    List<DeleteObject> dos = objects.stream().map(e -> new DeleteObject(e)).collect(Collectors.toList());
    Iterable<Result<DeleteError>> results = minioClient.removeObjects(RemoveObjectsArgs.builder().bucket(bucketName).objects(dos).build());
    return results;
}
}



